Q. An AC current can be produced by -
1) transformer
2) dynamo
3) choke coil
4) None of the above
Q. The theory that states "pieces of the Earth's crust are in constant, slow motion driven by movement in the mantle" is called -
1) The theory of Pangaea
2) The theory of plate tectonics
3) The theory of plate boundaries
4) The theory of continental drift
Q. The process that continually adds new crust is -
1) earthquake
2) seafloor spreading
3) convection
4) subduction
Q. How do vector vaccines work to provide immunity?
1) By directly attacking and destroying pathogens in the body
2) By placing the virus in a modified version of a different virus
3) By entering directly into the cells and enabling them to create spike proteins
4) By introducing a weakened or inactivated virus into the body
Q. Two objects of different masses falling freely near the surface of the Moon would -
1) undergo a change in their inertia
2) have same velocity at any instant
3) experience forces of same magnitude
4) have different accelerations
Q. The DNA double helix structure was discovered by -
1) Rosalind Franklin and Maurice Wilkins
2) Linus Pauling
3) Gregor Mendel
4) James Watson and Francis Crick
Q. Input and output nerves meet at -
1) heart
2) central nervous system
3) liver
4) None of the above
Q. Which of the following liquids is a bad conductor of electricity?
1) Lemon juice
2) Orange juice
3) Salted water
4) None of the above
Q. A photoelectric cell is a device which -
1) stores light energy
2) converts electric energy into light energy
3) converts light energy into electric energy
4) None of the above
Q. The image formed by the concave mirror is real, inverted, and of the same size as that of the object. The position of the object should be -
1) at the centre of curvature
2) between the focus and centre of curvature
3) beyond the centre of curvature
4) at the focus
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